<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <!-- 提示区域 -->
        <el-alert
          title="添加商品信息"
          type="info"
          show-icon
          center
          :closable="false"
        >
        </el-alert>
      </el-row>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex" :before-leave="beforTabLeave" @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类：" prop="goods_cat">
              <!-- options 用来指定数据源 -->
              <!-- props 用来指定配置对象 -->
              <el-cascader
                expand-trigger="hover"
                :options="catelist"
                :props="cascaderProps"
                v-model="addForm.goods_cat"
                @change="cateChanged"
                clearable>
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 显示富文本编辑器组件 vue ui，安装依赖 vue-quill-editor -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
      <!-- 图片预览对话框 -->
      <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }, { min: 2, max: 10, message: '商品名的长度在2~10个字符之间', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      catelist: [],
      // 指定级联选择器的配置对象 value 选中的那个值 label 看到的那个值 children 嵌套的那个值
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类的ID数组
      // selectedKeys: [],
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
      this.catelist = res.data
    },
    // 选择项发生变化触发这个函数
    cateChanged () {
      // console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    //
    beforTabLeave (activeName, oldActiveName) {
      // console.log('离开：' + activeName, ', 进入：' + oldActiveName)
      // let isB = false
      // this.$refs.addFormRef.validate(async valid => {
      //   if (!valid) {
      //     this.$message.error('请先填写基本信息，并完成验证！')
      //     return 0
      //   }
      //   if (oldActiveName !== 0 && this.addForm.goods_cat.length !== 3) {
      //     this.$message.error('请先选择商品分类！')
      //     return 0
      //   }
      //   isB = true
      //   return 0
      // })
      // return isB
      if (oldActiveName !== 0 && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    async tabClicked() {
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')
        res.data.forEach(item => {
          // eslint-disable-next-line no-unused-expressions
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        // console.log(this.manyTableData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败！')
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => {
        // eslint-disable-next-line no-unused-expressions
        x.pic === filePath
      })
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      // 1. 拼接得到一个图像信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2. 将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm)
    },
    add() {
      // console.log(this.addForm)
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项！')
        // 执行添加的业务逻辑
        // addForm 深拷贝，安装依赖 lodash cloneDeep(obj)
        // this.addForm.goods_cat = this.addForm.goods_cat.join(',') 会报错，影响cascader的数据绑定，需要进行深拷贝
        let form = {}
        // form = this.cloneDeepByJs1(this.addForm) 不怎么行
        // this.cloneDeepByJs2(form, this.addForm)
        // eslint-disable-next-line no-const-assign
        form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性 注意：静态属性的 attr_vals 本来就是一个字符串
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)

        // 发起请求，添加商品
        // 商品名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    },
    // 原生JS实现深拷贝
    // cloneDeepByJs1 (data) {
    //   const _data = JSON.stringify(data)
    //   const dataClone = JSON.parse(_data)
    //   return dataClone
    // },
    // eslint-disable-next-line vue/return-in-computed-property
    cloneDeepByJs2 (newobj, oldobj) {
      for (var k in oldobj) {
        // 判断我们的属性值属于哪种数据类型
        // 1. 获取属性值 oldobj[k]
        var item = oldobj[k]
        // 2. 判断这个值是否为数组
        if (item instanceof Array) {
          newobj[k] = []
          this.cloneDeepByJs2(newobj[k], item)
        } else if (item instanceof Object) {
          // 3. 判断这个值是否为对象
          newobj[k] = {}
          this.cloneDeepByJs2(newobj[k], item)
        } else {
          // 4. 判断这个值是否属于简单数据类型
          newobj[k] = item
        }
      }
    }
  },
  computed: {
    // 设置 三级分类ID 的计算属性
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-alert {
  // text-align: center;
  // left: 50%;
  // top: 50%;
  // transform: translate(-50%, -50%);
  // display: flex;
  // align-items: center;
}
.el-checkbox {
  margin: 0 10px 0 0 !important
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
